# MongoDB Atlas: Major incident: AWS Cluster DNS Changes Degraded Performance

**Summary:** MongoDB Atlas for Government had a major AWS cluster DNS degradation from 2026-05-07 15:17 UTC to 2026-05-07 22:15 UTC, lasting 6 h 57 min; cluster topology changes could be delayed or fail. MongoDB patched bad metadata causing ACME-related DNS issues and confirmed DNS and cluster updates were healthy. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-05-07 15:17 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/ryk5cwxqt8h4](https://stspg.io/ryk5cwxqt8h4)
- [Company: MongoDB Atlas](https://rewindex.com/company/mongodb-atlas.md)
- Versions: before (none: first archived) → after incident\_version:152/1t1nk96wgyx3@4a8b90422521
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ AWS Cluster DNS Changes Degraded Performance
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-05-07 15:17 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-05-07 22:15 UTC
```

**6. Added: Affected components**

```diff
+ MongoDB Atlas for Government
```

**7. Added: Update** (identified) · 2026-05-07 15:17 UTC

```diff
+ DNS changes for AWS clusters are currently degraded. We've identified the issue and are pushing out a patch.
```

**8. Added: Update** (identified) · 2026-05-07 15:20 UTC

```diff
+ DNS changes for AWS clusters are currently degraded. Cluster topology modifications may be delayed or not able to complete successfully. We've identified the issue and are pushing out a patch.
```

**9. Added: Update** (identified) · 2026-05-07 16:58 UTC

```diff
+ Mitigation is in progress; recovery for DNS operations and downstream cluster topology changes has begun.
```

**10. Added: Update** (investigating) · 2026-05-07 17:50 UTC

```diff
+ We are still seeing cases where new cluster update requests are failing to go through due to ACME related DNS issues. We are actively investigating this issue.
```

**11. Added: Update** (monitoring) · 2026-05-07 19:47 UTC

```diff
+ We've identified a bad piece of metadata causing DNS issues. We've since patched this metadata and are seeing recovery in ACME updates for cluster topology changes. We will continue to monitor recovery.
```

**12. Added: Update** (monitoring) · 2026-05-07 19:47 UTC

```diff
+ We are continuing to monitor for any further issues.
```

**13. Added: Update** (resolved) · 2026-05-07 22:15 UTC

```diff
+ DNS updates for ACME are confirmed healthy. Cluster updates are now proceeding as expected.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-05-07 15:17 UTC | Major incident: AWS Cluster DNS Changes Degraded Performance (this change) | degradation |

All MongoDB Atlas changes: [timeline](https://rewindex.com/company/mongodb-atlas/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/id73179968fee27 · Markdown: https://rewindex.com/change/id73179968fee27.md · JSON: https://rewindex.com/api/v1/changes/id73179968fee27 · Generated 2026-10-18T00:54:33.227Z